Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J19/32—Packing elements in the form of grids or built-up elements for forming a unit or module inside the apparatus for mass or heat transfer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J19/30—Loose or shaped packing elements, e.g. Raschig rings or Berl saddles, for pouring into the apparatus for mass or heat transfer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J2219/30—Details relating to random packing elements
  • B01J2219/319—Mathematical modelling
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
  • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
  • B01J2219/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
  • B01J2219/32—Details relating to packing elements in the form of grids or built-up elements for forming a unit of module inside the apparatus for mass or heat transfer
  • B01J2219/33—Details relating to the packing elements in general
  • B01J2219/3306—Dimensions or size aspects

Definitions

• the object underlying the invention was therefore the fouling of mass transfer columns to reduce and thus the distances between the required cleaning to enlarge.
• the contact angle on the three-phase contact line between solid, liquid and gas can be determined according to WO 00/39 049, such as with the contact angle measuring device G1 from Krüss. This is done on the surface of the packing or the packing a drop of distilled water (approx. 20 ⁇ l) is added and the contact angle is read off measured on the goniometer scale. You wait from the application of the drop to the measurement three minutes to allow the system to equilibrate.
• the static contact angle can be set with the aid of hydrophobizing substances.
• the filling or packing body used according to the invention preferably has a surface structure particles attached to the surface with an at least bimodal particle size distribution, where a particle size range (A) is an average particle diameter of at least 5 ⁇ m and the other particle size range (B) is medium Has particle size diameter of at most 3 microns.
• the weight ratio of the particles of the former particle size range (A) to the particles of the latter particle size range (B) assuming that these particles are each detached from the molded body Appropriately in the range from 0.01: 1 to 12: 1.
• the particles are at least bimodal Particle size distribution from one piece with the molded body itself.
• said particles in the particle size ranges (A) and (B) using a coating material to apply to the molded body.
• Such coating materials that are suitable for fixing said particles on the surface of the shaped body, are in the WO 00/39 049.
• WO 00/39 049 also describes molding compositions which have a pasty or pasty consistency can have and by known molding processes, such as by extrusion from a molded mouthpiece, by injection molding or the like, processed into moldings, which then Form molded body according to the invention.
• This coating agent is usually a dispersion of binder, filler and optionally usual additives, preferably in aqueous dispersion.
• the dispersion can also contain organic solvents, such as aliphatic or aromatic hydrocarbons, for example Toluene, esters or ketones, known as solvents for binders and paints are.
• the binder contained expediently comprises, in each case based on the total weight of the Solids content of the molding or coating material, 0.2 to 20 wt.% At least one hydrophobic resin, resin precursor and / or wax and at least 0.5 to 40% by weight an additional hardening binder.
• the hydrophobic resins or waxes used are preferably also oleophobic.
• the Hydrophobic resins or waxes, preferably resins are expediently silicone resins which are used in In the case of aqueous dispersion must be emulsifiable or emulsified in water. Instead of silicone resins however, other resins, such as fluoropolymers, may also be used.
• the resin intermediates can be, for example, silanes that polymerize to silicone resins. It is essential that these resins are hydrophobic. Waxes are inherently hydrophobic and can therefore, as a rule be used as a proportion of the hydrophobic binder.
• the additional curing binders can be organic or inorganic in nature.
• organic curing binders are alkyd resins, polyvinyl chloride, chlorinated rubber, Polyurethanes and epoxy resins.
• inorganic curing binders are hydraulic binders such as cement or lime.
• Organic polymers are preferably used as additional hardening binders.
• the inorganic or organic fillers with at least bimodal particle size distribution are appropriately selected so that the particles of the former particle size range (A) have an average particle diameter in Range of 5 to 100 microns, preferably in the range of 8 to 40 microns, especially in the range from 10 to 40 ⁇ m, especially from 10 to 20 ⁇ m.
• the particles of the latter particle size range (B) preferably have an average particle diameter of at most 0.1 ⁇ m, preferably in the range of 0.1 to 0.8 ⁇ m.
• the coating materials can also still contain fillers of other particle size ranges and thus more than bimodal, i.e. H. have a multimodal particle size distribution. Especially in the case of cleaning additional portions of coarse grits may be present.
• the average particle diameter is calculated from the sum of the largest particle diameters, divided by the number of the particles.
• the weight ratio of the particles of the first particle size range (A) to the particles the last particle size range (B) is preferably in the range from 0.3: 1 to 10: 1, especially in the range from 1.0: 1 to 2.5: 1.
• the fillers with at least bimodal particle size distribution can be a uniform filler of different particle sizes or filler mixtures be, in particular those in which the particle size range (A) of one Filler and the particle size range (B) is formed by another filler.
• the particle size ranges (A) and (B) can each be of several different types of fillers are formed.
• the fillers can be organic or inorganic Be natural, preferably inorganic.
• the filler with the particle size range (A) can be, for example, silicon dioxide, calcium carbonate or Teflon.
• the filler with the particle size range (B) can also silicon dioxide or for example Be titanium oxide. It is useful for the particle size range (A) and cristobalite Particle size range (B) titanium oxide, a colored pigment or a filler. It However, several fillers can also be used. Cristobalite is appropriately used as quartz flour used.
• the binder suitably contains, based in each case on the solids content of the Coating material, preferably 1.5 to 30, particularly 2 to 15 wt.%, Very particularly to 6% by weight of additional hardening binder and 1 to 15, in particular 1.5 to 4% by weight hydrophobic resin, resin precursor or wax, especially silicone resin, silanes, siloxanes or Polysiloxanes.
• binders that are as low as possible Contain water-soluble and / or hydrophilic substances such as emulsifiers and stabilizers.
• Hardening binders which are expediently used are copolymers of acrylic and Methacrylic acid esters with styrene or ethylene vinyl laurate vinyl chloride.
• Other useful curing agents Binders are pure acrylates, styrene acrylates and other preferably saponification-resistant Polymers or copolymers.
• the silicone resins that can be used are for example those with alkyl or alkoxy groups, where they are preferably emulsifiable in water or are emulsified.
• the customary additives which may have been added can optionally be hydrophobicized and are, for example, thickeners, such as polyurethane thickeners, wetting agents and / or defoamers, each conveniently in small amounts, especially in amounts below 2% by weight of the solids content of the coating composition are added.
• thickeners such as polyurethane thickeners, wetting agents and / or defoamers

Landscapes

• Chemical & Material Sciences (AREA)
• Physics & Mathematics (AREA)
• Thermal Sciences (AREA)
• Organic Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Paints Or Removers (AREA)
• Prevention Of Fouling (AREA)

Applications Claiming Priority (2)

Publications (3)

Family

ID=27675144

Family Applications (1)

Country Status (2)

Cited By (10)

Family Cites Families (4)

• 2002
  • 2002-02-28 DE DE2002108930 patent/DE10208930A1/de not_active Withdrawn
• 2003
  • 2003-02-11 DE DE50311406T patent/DE50311406D1/de not_active Expired - Lifetime
  • 2003-02-11 EP EP20030002949 patent/EP1340536B1/fr not_active Expired - Lifetime

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